System and its method for carrying out TCP application layer protocol package for VPN message
A technology of application layer protocol and message, which is applied in the direction of transmission system, data exchange through path configuration, electrical components, etc., can solve problems such as temporary fixes but not root causes, and achieve the effect of increasing adaptability
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[0066] Further explain below in conjunction with accompanying drawing:
[0067] Taking HTTP application encapsulation as an example, Figure 4 shows the whole process of VPN communication encapsulating HTTP protocol.
[0068] In FIG. 4 , the first VPN device 9 and the second VPN device 11 respectively protect different first subnets 8 and second subnets 12 . There is a firewall 10 between the two VPN devices, and the firewall 10 only opens port 80 to the outside world and only allows WWWW access. In this case, if a VPN tunnel is to be established between the two VPN devices 9 and 11 , traditional IPSec communication packets will not be able to pass through the restriction of the firewall 10 . In order to communicate smoothly, the two VPN devices 9 and 11 need to enable the HTTP application protocol encapsulation function to pass through the firewall 10 .
[0069] First of all, configuring a VPN tunnel on the first VPN device 9 requires HTTP application encapsulation, so when ...
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